alexa Co-digestion Effect Of Food Waste Leachate In The In-situ Biogasification Of Sewage Sludge In South Korea | 67867
ISSN: 2090-4541

Journal of Fundamentals of Renewable Energy and Applications
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5th World Bioenergy Congress and Expo
June 29-30, 2017 Madrid, Spain

Dongjin Lee and Jisu Bae
National Institute of Environmental Research, Republic of Korea
Posters & Accepted Abstracts: J Fundam Renewable Energy Appl
DOI: 10.4172/2090-4541-C1-030
Abstract
This study was to find out co-digestion effect of food waste leachate in the in-situ biogasification of sewage sludge in South Korea. The 4 facilities for the biogasification of sewage sludge and 8 facilities for co-digestion treating sewage sludge and food wastes were selected as a target for this study. Precision investigation (methane yield, organic loading rate, etc.) was conducted during January 2015 to June 2016. Table 1 presented methane yield with food waste leachate additions in the biogasification of sewage sludge in ongoing biogasification facilities of sewage sludge mainly. Additions of food waste leachate gave an effect on methane yield in the anaerobic digestion of sewage sludge. Methane yield of sewage sludge was 0.199 Sm3CH4/ kgVSin. Methane yields of sewage sludge adding food waste leachate dramatically increased from 0.298 Sm3CH4/kgVSin to 0.458 Sm3CH4/kgVSin according to an increase of quantity of food waste leachate from 6.0% to 63.0%, respectively. Inhibition factor of anaerobic digestion such as volatile fatty acid, NH4+-N, and VFA/alkalinity ratio, etc., were investigated, and pointing out stable digesters under 590 mg/L, 2,340 mg/L, and 0.15, respectively. Removal of nitrogen and phosphorus has been increasingly issued in the sewage treatment plant. Even though the additions of food waste leachate give the favorable effect of anaerobic digestion of sewage sludge, accumulation of nitrogen and phosphorus in accordance with the additions of food waste leachate could not be understated. Total nitrogen and phosphorus in dewatering supernatant of digested sludge were 1.04% and 0.86% of design capacity of the sewage treatment plant, respectively. Therefore, the additional input of food waste leachate in the anaerobic digestion gives an advantageous effect for an increment of methane productivity without any huge hindrance up to 60% of food waste leachate mixing with sewage sludge in in-situ digestion system in South Korea.
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